1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e6ee387a1e312ecefeb79a9a75ea93cfb33a1b93a8a304258ddbb9e8c4cc23f. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/22b9b351-5165-4bb6-b934-de86e74687dc.json and https://artists.proofprofile.net/proofs/artist/22b9b351-5165-4bb6-b934-de86e74687dc.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf59e7cf18a7520fe0dfb50ed22d990ca7609b6a2f80c163100a3d2a990052908. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4Q2570131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d1c285ff0c1c6472eb431a4170ea505b552251b6e8cf1f19c66a5432b5ac766. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4Q2570132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57e27c37acc52f736d3d58f28d6ef342c875757f1aea2f1b11d3485dd0537457. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4Q2570133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf203a27c774564b07ab162f24ea600c610504a9c249fc9fa80bf21c7a82309f. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4Q2570134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b867b762eb46cee30a17454d344cd3c015ddb2d003b5fc62a76a90efc677232. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4Q2570135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc522cefe250d555ebfe9ace3daf3982fcab730b5582c80d209994ddffa1e72a1. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4Q2570136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5c7d11275e52ec07be60e2c27b3ce2772ca0fefa39a5f2e8d691684433912f1. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4Q2570137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa76fbc16499d9160a84c1a384e4c60886d4c34da06c942a0b5c89ac59f969738. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4Q2570138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1521f14ee46cac738d68f9a715f408c84993bec18ba46bc3be96fa1bf83b4b3. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4Q2570139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0475b990a64c92271fa7fe5fd4c447f74e6699018a214e9930fd6618fe579383. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4Q2570140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xada3b8b774945ad6bb0f696286ac11054041c4a27daeb94a60f3234492cdd6fb. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4Q2570141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59a5ad056f5c43103ca792106e66a55b33a785f0cb0208068c8aa9e54e12d4a1. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4Q2570142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94c1f47ead873e4949a571ddbddae0a3eae5074507f6b48c3e8f62d4b0396496. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4Q2570143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf45fecdd728efc1c654e2a34a68ce9498ee93807b6c751e992f9a89870ae998f. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4Q2570144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d6cbd1d2ef46cd6f85250be9f99c6f8ade6202c3ef618a40dfb5957cd3b21aa. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4Q2570145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b97bd808748e677f60784511d7967e7f66e7480ca8421de480bbe6df92f920b. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4Q2570146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x574da2b096e0367b8f11eff53db89405e07122baa6d03bfaa30002a755a0acfc. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4Q2570147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98eb87384792f4b28883f231ff5803ae19e67e1a25fee0dfeba0ecda8ed1ae18. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4Q2570148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc13416568c3de1faa1ff9f0cf10d3aa6781edcc56e840a3d3c253cfea53e4a99. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4Q2570149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18ea1f9e3e6ff153754ca9deef4667f04699e91e22eab1523158f180738b007b. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4Q2570150.